Chimney for furnaces



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D. MGB. GRAHAM'.

UHIMNE'Y FOR PURNACBS'.

No. 290,573. Patented Dec. 18, 1883.

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(NoMGdel.) 2 Sheets-Sheet 2.

n.M GRAHAM.

CHIMNBY POR FURNAGBS.

No. 290,573. l Patented Deo. 18, 1883..

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'Unteren Sterns PATENT @erica DAXIEL MCBRIDE GRAHAM, OF CHICAGO,ILLIXOIS.

CHHVINEY FOR FURNACES.

SPECIFICATION forming part oi' Letters Patent No. 290,573, datedDecember 18, 1883.

ApplicationiledMay1,1883. (No model.) y

To @ZZ whom t mtl/ zj concern:

Be it known that I, DANIEL MoBRiDE GRA- HAM, of Chicago, in the countyof Cook, ofthe State of Illinois, have invented a new and usefulImprovement in Chimneys for Furnaces, Sac.; and I do hereby declare thesame to be described in the following specification and represented inthe accompanying drawings, of which- Figure I is a Vertical section of achimney and a tire-place thereoi` provided with my invention, the natureof which is defined in the claim hereinafter presented. 2 is a likesection, exhibiting the chimney and fireplace and their adjuncts asapplied to an upright multitubular boiler, as will be hereinafterexplained.

The obj ect of the said adj uncts is to abstract by means of air theheat of the smoke and spent Volatile products arising from the combustion of the fuel, and to introduce such air in its heated state int-othe {fire-place, and to do this either above or below the fuel, or bothabove and below it, so as to promote combustion of such fuel and thesmoke and gases arising therefrom.

The chimney is double walled. In other words, it has an inner wall, b,and an outer wall, a, and between them a space, c, which encompasses thesaid inner wall, and also extends down alongside of or about thefire-place or chamber of combustion d. This space, by means of across-partition, e, arranged just above the fireplace, is divided intotwo separate chambers, c and c', the upper of Vwhich is closed nea-r orat the top of the chimney.

In thefpart of the chimney which is above the fire-place d isatubularair-heater, A,Which is a drum having tubes f f f, extending up throughit from end to end and opening through such ends. In the lower head ofthe drum is a series of holes, g, for discharge of air into the upperpart of theire-place. There is also in the lower part of the air-heaterone or more openings, h, leading from the air-receiving space of thedrum into the chamber c'. There is also in the lower part of the chamberc one or more openings, t, to allow air to pass into the chamber c.Furthermore, there is also in the upper part of the chamber c one ormore openings, it, to lead air therefrom into the drum of theair-heater. There is also one or more openings, Z, leading from thechamber c into the ash-chamber below the grate m ofthe fireplace. Ineach opening h there should be a damper, o, for closing it, and theremay or should be to the opening t a damper or air-register.

4In the operation of the above described chimney and rire-place, thesmoke and heated gases proceeding from the fire, when in the chamber d,pass upward through the tubes f of the air-heater to and out of the headof the chimney. In their passage heat is abstracted from them by thesaid pipes and radiatedinto the drum, whereby the air therein will beraised in temperature, and by the draft upward through the said pipeswill be caused to flow downward through the openings g into the upperpart of the chamber of combustion, air in the meantime rushing into thehole or -holes t, and upward in the space c, and thence through the holeor holes l; and into the drum.

To the holes g there should be a valve to close them entirely orpartially, as occasion may require, such valve being shown at o. Onclosing the said Valve, in whole or in part, and opening the damper ofthe hole h, heated air from the drum may be caused to pass into thespace c', and thence into the ash-chamber and upward through the grateand fuel, the said air being further raised in temperature by the heatradiated from the walls of the lire-place.

vThe heated air may be let into the upper part of the chamber ofcombustion, and into the ash-chamber at one and the same time, or intoeither, as circumstances may require, for the purpose of facilitatingcombustion ofthe fuel and the smoke and gases arising therefrom.

In Fig. 2 an upright multitubular boiler or steam-generator is shown atB, as disposed within the fuel and smoke chamber d directly over thegrate m, there being over this boiler a smoke space or chamber, s, intowhich the smoke and unburned gases from the fuel pass space c at thesides of or about the lire-place, I such chambers c and c and air-heaterbeing 1c provided with the openings i, 7c, g, h, and l, arranged as andfor the purposes speoied. DANIEL MCBRIDE GRAHAM.

Witnesses:

R. H. EDDY, E. B. PRATT.

